In article <bntyhntrCrIuxA.86D@netcom.com> bntyhntr@netcom.com (Vincent) writes:
>
>Does anyone know what is the official Simplex spacing is between two pairs of
>pairs of stations right next to each other on 2 meter? If there is another station interfering with your simplex transmissions how far do they have to be from you officially? Just windering.....
Zero point zero zero miles. There is no interference free guaranteed
zone for co-channel or adjacent channel operations in amateur radio.
Unlike broadcast, amateurs aren't assigned a specific frequency, and
are expected to use frequency agility to solve interference problems.
That's not always practical, especially with repeaters, so there are
some voluntary bandplan guidelines, but they don't have force of law.
In some parts of the country, channels are on 20 kHz centers, and
in other parts of the country channels are on 30 kHz centers. Stations
operating on such separations *shouldn't* interfere with each other
if the transmitters and receivers of all parties are adjusted correctly
and signal strengths are comparable. If the off channel stations' signals
are markedly stronger than the one's you are attempting to copy, you
may still get interference. That's the way it goes with amateur grade
equipment.
If the standard deviations are used, and optimal receiver filtering
is used, stations of equal power separated by 20 kHz *should* be
compatible. But that's rarely the case. That's partially why some
parts of the country prefer 30 kHz channels (though in practice
they may use 15 kHz splits which almost certainly can cause co-channel
problems).
Gary
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